<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>圣杯布局</title>
  <link rel="stylesheet" href="./common.css">
</head>
<body>
  <div class="g-container">
    <div class="g-left">left</div>
    <div class="g-middle">middle</div>
    <div class="g-right">right</div>
  </div>
</body>
</html>